发明名称 |
VORKERAMISCHE ZUSAMMENSETZUNG UND KERAMISCHE ERZEUGNISSE. |
摘要 |
Low density SiC ceramics having improved bending and specific strengths are prepared by (A) intimately mixing about 50-85% by weight of SiC powder with about 15-50% by weight of a preceramic polysilazane binder, (B) pulverizing the mixture to form particles having a particle size smaller than 105 micrometers, (C) separating from those particles any particles having a particle size larger than about 105 micrometers, (D) molding the resultant composition having a particle size not larger than about 105 micrometers, and (E) pyrolyzing the molded composition in an inert atmosphere to a temperature of about 1200 DEG -1450 DEG C. In a preferred embodiment of the invention, the preceramic binder is at least one polysilazane prepared by reacting an organodihalosilane with ammonia, treating the ammonolysis product with a basic catalyst which is capable of deprotonating an NH group that is adjacent to an SiH group, and quenching the resultant product with an electrophilic quenching reagent. |
申请公布号 |
DE3875959(T2) |
申请公布日期 |
1993.03.18 |
申请号 |
DE19883875959T |
申请日期 |
1988.11.08 |
申请人 |
ETHYL CORP., BATON ROUGE, LA., US |
发明人 |
SEMEN, JOHN, BATON ROUGE, LA 70809, US;ROGERS, JOSEPH, JOHN, BATON ROUGE, LA 70806, US |
分类号 |
C04B35/56;C04B35/571;C08K3/14;C08K3/34;C08L83/02;C08L83/16;(IPC1-7):C08K3/34 |
主分类号 |
C04B35/56 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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